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Hello @venkateshkv unfortunately it is very easy to spend your gold without even noticing. I once accidentally purchased 20 Striped Brush because I touched the booster icon without meaning to. The issue is caused because there is no 'confirmation' or 'are you sure' button. Once you 'spend' the gold it is spent immediately and sometimes you can not even notice.
In my case I noticed my gold had decreased and couldn't remember buying anything. I eventually noticed the twenty Striped Brush and realised what had happened.